Measuring facial symmetry: a perception-based approach using 3D shape and color

Area of Science:

• Maxillofacial Surgery
• Aesthetics
• Biomedical Engineering

Background:

• Facial symmetry is crucial for aesthetic perception.
• Restoring facial symmetry is a key goal in maxillofacial surgery.
• Objective measures for facial asymmetry are needed.

Purpose of the Study:

• To develop an objective measure of facial asymmetry using both shape and color.
• To validate this measure against subjective perceptions of symmetry and attractiveness.
• To explore its potential applications in surgical evaluation and craniofacial prosthetics.

Main Methods:

• Acquired optical 3D face scans from 30 healthy adults.
• Calculated asymmetry indices by quantifying color and spatial differences between faces and their mirror images.
• Collected subjective symmetry and attractiveness ratings from 100 individuals for validation.

Main Results:

• Symmetry ratings significantly correlated with color and geometric asymmetry indices.
• Attractiveness ratings showed weak correlation with individual indices.
• The combined index (product of shape and color indices) significantly correlated with both symmetry and attractiveness perceptions.

Conclusions:

• A novel combined asymmetry index, incorporating shape and color, effectively reflects subjective perceptions of facial symmetry and attractiveness.
• This objective measure shows promise for evaluating surgical outcomes and designing craniofacial prostheses.
• The findings support the use of this index as a valid tool for assessing facial aesthetics.